Method of obtaining lead oxide in alpha state of high dispersion



Patented Mar. 11, 1930 UNITED STATES LUDWIG SCHERTEL AND WILLI LurY, 'rn. GOLDSCHMIDT OF ESSEN, GERMANY, ASSIGNORS TO THE FIRM GERMANY No Drawing. Application filed February 4,1925, Serial No. 6,894, and in Germany February 8, 1924.

into lead-oxide vapors approximating gaseapplication of heat, the y or carrying out the invention one may proceed as follows: Lead oxide or molten metallic lead is allowed to drizzle through a shaft filled with blocks of refractory material heated to very high temperature of say 10001200 C. by oxidizing fire gases flowing upwards through the shaft. Thereby the molten lead or the lead oxide, as the case may be, is converted into vapor, at the same time being converted into lead oxide. The lead oxide vapors dispersed in thefire gases leave the shaft at its and duced into the gas current carrying the lead oxide vapor, the quantity of air being preferably 1 to 2 volumes of air to 1 volume of gas mixture. Thereby in temperature of the gas mixture from say 1000 to 500300 C. is efi'ected and the lead 'jecting the cooled gas particles of lead oxide a sudden reduction oxide vapor condensed into particles of extreme fineness which remain suspended 1n plant without material loss in substance.

further increase in output may be secured by using the suitably cooled purified gas, which leaves the gas purifying'or lead oxide preceipitating plant as a means for suddenly cooling the fire gases containing the lead oxide vapors. doing so it is only by avoid the loss of that quantity of lead oxide which otherwise would be carried away with the air admixed to the fire gases.

In afurther embodiment of the invention The dispersity of the lead oxide obtained is nearly related to the intensity of cooling the gas medium carryin the vvapors of lead oxide. The degree of d ispersity can be increased within certain limits by increasing the suddenness of cooling the gas medium.

What we claim is:

1. A method of obtaining lead oxide in a state of high dispersion from a hot gas medium carrying lead oxide vapors comprising suddenly cooling said gas medium and sub medium with the fine suspended-therein to ust precipitating means.

2. A method of obtaining lead oxide in a state of high dispersion from a hot gas medito dust precipitating means. 3. A method of obtaining lead oxide in a state of high dispersion from a hot gas medium carrying lead oxide vapors comprising introducing a form into said cooling medium gas medium and subjecting in gaseous the cooled gas medium with the fine particles of lead oxide suspended therein to dust pm cipitating means.

In testimony whereof we have signed our names to this specification.

UDWIG .SCHERTEL.

WILLI LUTY. 

